Super functioning, even in our old (ie complex) mains we had no problems. Of course, the data rate depends quite strongly on the power grid, the "up to" indications are therefore, as the DSL contract, rather than a policy of real value reached. "Up to 200 MBit / s" are of course completely impossible because the devices only have Fast Ethernet connections, ie the connection to the PC only supports a maximum of 100 Mbit / s.